Postfix - accept all email to any user at any domain

You can do this using virtual mailboxes. Instead of the usual lookup maps, you'd have a PCRE table that looks like this:

/.*/ spamuser

to return the username spamuser regardless of what email address is the recipient.

In your postfix.conf you'd have the line

virtual_alias_maps = pcre:/etc/postfix/virtual

There's more information about both virtual alias maps and PCRE tables at postfix.org

Here is how I done it

create user webmail

adduser webmail

I had to install the postfix-pcre package. Code:

 sudo apt-get install postfix-pcre

I created a file called /etc/postfix/virtual as follows:-

Code:

/.*/                        webmail

edited /etc/postfix/main.cf to add this line:

virtual_alias_maps = pcre:/etc/postfix/virtual

For the absolute newbies (like me), if the configuration is correct, the query command: Code:

postmap -q test@a pcre:/etc/postfix/virtual

would return the email id specified in virtual file (/etc/postfix/virtual). In this case. Code:

webmail

To test the working, use the mail command from the terminal. Code:

mail [email protected]

enter the subject, mail body and press Ctrl+D (to exit the compose window).

To view the message use the following command. (webmail is the mail id configured in virtual file. Substitute with your name.) Code:

mail webmail

PS:To check the mail log use the following command. Code:

tail -f /var/log/mail.log

If you want to make postfix into an open proxy that will accept mail for any domain, you may want to look into this piece of code: http://www.postfix.org/smtp-sink.1.html

It's basically a load tester (accept then discard), but you can also configure it to accept then store.